Catalyst Heater Circuit Performance Bank 2

Common symptoms

What you'll notice

• Inspect the wiring and connectors of the catalyst heater circuit in Bank 2 for any signs of damage or corrosion.
• Check the operation of the catalyst heater relay and replace if necessary.
• Test the catalyst heater circuit components in Bank 2, such as the oxygen sensors and catalytic converter, to ensure they are functioning properly.
• Clean or replace the catalyst in Bank 2 if it is clogged or damaged.

Common causes

Most likely first

1. Faulty catalytic converter
2. Malfunctioning oxygen sensor
3. Clogged or damaged exhaust system
4. Ignition misfire
5. Faulty engine control module (ECM)

How to diagnose & fix

Work through it in order

1. Decreased engine performance or power
2. Engine misfires or stumbles
3. Increased fuel consumption
4. Check engine light illuminated
5. Problems with starting the engine